Did you know?
Anachronistic Hardware
Despite being pulled from time by Dr. Brown in 1922 (born 1891 + 31 years old), Brocken's backgrounds in World Heroes 1 and 2 both feature German vehicles from WWII (1939–1945). The tanks in his WH stage appear to be Pzkpfw. VI Tigers and the airplane appears to be a Focke-Wulf 190. The tank that breaks through the wall in his WH2/Jet stage is a Jagdpanther.
Great Scott
One might think that Dr. Brown, the time-travelling doctor of the World Heroes series, may have the first name Emmett. His full name is, however, Brown Sugar.
World Zeroes
The Neo Geo CD fan disk "ADK World" contains some early and unused character sketches for various games. Clockwise from upper left, these World Heroes sketches are: Tutankhamun, Al Capone, Billy the Kid, Nero, an early Hanzou design, an early Jack design, Napoleon, and Miyamato Musashi.